<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 200px;
            height: 200px;
            background-color: pink;
        }
        .box::after{
            content: attr(data-params);
            width: 50px;
            text-align: center;
            display: inline-block;
        }
        /* 样式传递参数的关键字是attr，注意传输的参数名要与定义的一致 */
    </style>
</head>
<body>
    <div data-params="888" class="box">
    </div>
</body>
</html>